OWC technology selection: choosing the composting route a site can actually run.

An organic waste converter (OWC) is on-site equipment that processes segregated wet waste (food and kitchen waste, garden trimmings) into compost or biogas at the premises where it is generated. It replaces transporting wet waste to a distant processing site or a landfill, which is exactly what the Solid Waste Management Rules 2016 push generators away from.

Bulk waste generators. The Solid Waste Management Rules 2016 place on-site processing obligations on bulk generators, commonly defined as premises generating 100 kg per day or more of waste, and on housing societies above a threshold that the local body sets. Because the qualifying threshold for group housing and the enforcement route are set locally, the applicable bye-law should be confirmed with the municipal corporation.

Aerobic composting uses oxygen and produces compost; it is simpler to run, tolerates variable feed and suits sites that can use or dispose of the compost. Bio-methanation is anaerobic, produces biogas that can offset cooking fuel or generate power, and needs a steadier, high-moisture food-waste feed and a more capable operator. Sites with a large, consistent kitchen waste stream and a use for the gas favour digestion; mixed and variable streams usually favour composting.

The measured wet-waste generation in kg per day, not headcount alone. Sizing has to allow for the peak day rather than the average (a canteen, a banquet season or a festival can double the load) and for the residence time the chosen technology needs. Undersizing forces waste back into the municipal stream on exactly the days an inspection is most likely.

It varies with the route and the capacity. A powered mechanical composter occupies a compact machine room but draws power through its shredding and heating cycle; vermicomposting needs more area but little power; a digester needs a plant footprint plus gas storage and a slurry-handling area. The space, three-phase power, water point and drainage requirement should be confirmed against the specific model before a location is fixed.

Most sites use it in their own landscaping, which is the cleanest answer because it closes the loop on the premises. Where output exceeds landscape demand, it is handed to the local body or to an agricultural or horticultural offtaker. The offtake route should be settled before commissioning, since unmanaged output accumulating on site becomes its own nuisance.

It depends on the technology, the scale and the state. A small on-site composter within a premises is generally treated as part of the generator's waste management obligation rather than a separate consented activity, while a bio-methanation plant with gas utilisation or power generation attracts closer scrutiny. The position should be confirmed with the State Pollution Control Board and the local body before installation.